;; CSE 413 16au
;; Lecture 1 - DrRacket interactions window
;; Hal Perkins


Welcome to DrRacket, version 6.6 [3m].
Language: racket, with debugging; memory limit: 128 MB.
> 17
17
> 43
43
> -1
-1
> (+ 1 2)
3
> (+ 1 2 3 4)
10
> +
#<procedure:+>
> (+ 1 (* 2 3))
7
> (* (+ 1 2) 3)
9
> *
#<procedure:*>
> (define three (+ 1 2))
> three
3
> two
. . two: undefined;
 cannot reference an identifier before its definition
> (define xvii 17)
> (< three xvii)
#t
> (if (< three xvii) 11 22)
11
> (define (twice n) (* 2 n))
> (twice 3)
6
>